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Unread 01-25-2015, 07:07 PM   #1
ikidd
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1998 ZJ 
 
Join Date: Aug 2012
Location: Edmonton, Alberta
Posts: 75
Quadratrac rebuild questions

I have a QT with a stripped brake cup in the front, and the cup surface on the carrier in the back is bad. I'm looking at replacing the carrier, front spline shaft, and one brake cup. I'm guessing the only source for these now is salvage, correct?

Which leads to the MM part-time conversion kit. What the best source, which one (regular or 16% OD) if I'm mainly planning on offroad and city driving? And best place to get a reasonable quality chain for either of these options? Any place in Canada to get this?

I can't imagine there's much in the way of options that would rival the cost of this changeover anyway, bolt on.

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1998 ZJ 5.9 - 4", NP242
1998 ZJ 4.0 - Stock
1977 CJ7 304 Auto
1994 ZJ 4.0 "Rammy" RIP
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Unread 01-25-2015, 07:27 PM   #2
skizriz
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1978 CJ7 
 
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Correct, the only replacement parts you need will be from a salvage somewhere. Stripped a set of cones out myself. I've had bad luck mixing and matching brake cones and carrier also. They wear as a set, and should be kept together, in their proper sides.

The part time conversion will replace all of what you need. The Mile Marker kit comes with or without a chain. The chains aren't good quality though.

BJs Offroad has USA made chains now. I haven't heard of any reports on their quality though. http://www.bjsoffroad.com/ProdList.asp?scat=53

The over drive isn't like an actual overdrive. It will raise the gearing completely across the board. Essentually turning your 3.54 gearing into 2.70 gearing( just a number off the top of my head for example). Maybe worth it is you have stock tires, and do lots of highway miles.

Cost wise....I converted my Qtrac to a Dana 18, and probably have about $800 tied up into it.
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78 CJ7.. 258.. TH400/Dana18.. SOA/stock YJ springs.. 35" General Grabbers.. Waggy 44s.. 4.88 gears...Spartan/Lockright...Fiberglass front to rear
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Unread 01-25-2015, 07:47 PM   #3
ikidd
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1998 ZJ 
 
Join Date: Aug 2012
Location: Edmonton, Alberta
Posts: 75
Yes I saw BJs. I have certainly heard bad things about the Chinese chains but 250 for a good chain is pretty hard to swallow.

What are the advantages to a D18 and where are they typically sourced? Salvage? Driveshafts swap over?

Good info on the OD, that's what I thought but glad to have it confirmed. Not the way to go for me then.
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Unread 01-25-2015, 08:01 PM   #4
skizriz
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The Dana 18 is a gear drive, part time case. It uses the same off set rear output as the Qtrac does, so the rear axle doesn't need swapped.

There are plenty of sources for them, old Jeeps, Scouts. Some dana 18's are better than other. Some are more common than others. They are plenty tough, and usually sell cheap. I paid $100 for mine, and put in new gaskets and seals.
http://www.novak-adapt.com/knowledge/model_18.htm

To do the swap, the adapter is somewhat expensive at about $600. The transmission needs torn down to replace the tail shaft.

If I remember correctly, my rear drive shaft needed lengthened, and the front just needed the double cardan joint cut off and replaced with a normal yoke.

I have a thread with the swap. Some of the pictures may be missing though. I've pounded the hell out of the 18 since putting it in without a hiccup.
http://www.jeepforum.com/forum/f8/qu...hread-1570079/
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78 CJ7.. 258.. TH400/Dana18.. SOA/stock YJ springs.. 35" General Grabbers.. Waggy 44s.. 4.88 gears...Spartan/Lockright...Fiberglass front to rear
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Unread 01-25-2015, 08:06 PM   #5
Newbjeep
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Can you elaborate a little on the qtec O.D.?
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Unread 01-25-2015, 11:11 PM   #6
ikidd
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Location: Edmonton, Alberta
Posts: 75
Thanks for the link on the D18 build. I'd love to do that, I like a gear drive tcase. But I really don't want to get into the TH400 past the valve body. If I pulled that, the engine would go away and a 350TBI would take its place. I don't really have the time to do it right, so I'll see about the MM and a new chain. The 1339 is in good shape otherwise, no rounding on the gear shoulders or case damage.

I'll see if North Shore in Vancouver carries them and go from there.

Thanks again.
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1998 ZJ 5.9 - 4", NP242
1998 ZJ 4.0 - Stock
1977 CJ7 304 Auto
1994 ZJ 4.0 "Rammy" RIP
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